Interesting. If you thought the EU didnt care what happened with Brexit, this rash move puts all that to bed.
The UK primed the narrative of this being being primarily connected to some rancour over Brexit, history (WWII) and historic competition when I do not see it being reported that way on the German side.
Germany/EU placed an order in Autumn 2020, from what I heard. If you have two open orders are you at liberty to fully fulfil the first, while 100% ignoring your obligations under the second (also behind schedule) order? Do people imagine that AZ will deliver every single vial to the UK before delivering any to the EU. I am guessing not. These were both advance orders, with later delivery, rather than the direct purchase of stock.
If AZ owed the UK 10 million and the EU 20 million then the normal behaviour would be to inconvenience both customers to roughly equivalent degrees, with some positive skew towards the UK for ordering earlier. During periods of oil shortage, the leading nations, all expect to get a percentage less than normal. They do not expect for deliveries to shrink to zero, while other leading countries are serviced. So if AZ had promised both parties 2million/month and they were operating 50% under capacity they would deliver 1million to each rather than just the total production of 2million to only one.
If it is being suggested that AZ is fair in unilaterally deciding who to deliver to then that means that they could very well stop supplying the UK altogether, until after it fulfilled all of the EU orders. I can't imagine that the UK would think that fair and proper.
The EU is asking for deliveries (exports) to be catalogued so they can gauge the relative rate that AZ is being delivered to the EU/UK.
Tracking that information would I can imagine be needed for later reclamation (legal or not) or just even to fully assess their position after the event.